JP2002185287A - 4-pole monolithic filter - Google Patents
4-pole monolithic filterInfo
- Publication number
- JP2002185287A JP2002185287A JP2000384792A JP2000384792A JP2002185287A JP 2002185287 A JP2002185287 A JP 2002185287A JP 2000384792 A JP2000384792 A JP 2000384792A JP 2000384792 A JP2000384792 A JP 2000384792A JP 2002185287 A JP2002185287 A JP 2002185287A
- Authority
- JP
- Japan
- Prior art keywords
- monolithic
- filter
- electrode
- electrodes
- corner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、1枚の水晶基板に2個
のモノリシック・フィルタを形成した、4ポール・モノ
リシック・フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-pole monolithic filter in which two monolithic filters are formed on one quartz substrate.
【0002】[0002]
【従来の技術】近時、一枚の水晶基板に複数個の電極対
を近接して形成することにより一方の振動子の振動モー
ドを他方の振動子の振動モードと結合させ、その振動エ
ネルギーを一方の振動から他方の振動へと伝搬させて音
響結合を生じるようにしたフイルタ、いわゆるモノリシ
ック・フィルタが多用されている。2. Description of the Related Art In recent years, a plurality of electrode pairs are formed close to one quartz substrate to couple the vibration mode of one vibrator with the vibration mode of the other vibrator and to reduce the vibration energy. A filter that propagates from one vibration to another vibration to generate acoustic coupling, a so-called monolithic filter, is often used.
【0003】このようなフィルタで、より良好な減衰特
性を要求される場合、たとえば図2に示す回路図のよう
に2個のフィルタ11、12を縦続(カスケード)接続
し、この縦続接続点とアース電位との間に負荷容量のコ
ンデンサ13を介挿することが行われている。たとえば
特開平9−46170号には、1つの容器に2個のフィ
ルタを縦続接続して収納したものが開示されている。When such a filter is required to have better attenuation characteristics, for example, two filters 11 and 12 are cascaded as shown in a circuit diagram of FIG. A capacitor 13 having a load capacitance is interposed between the capacitor 13 and a ground potential. For example, Japanese Patent Application Laid-Open No. 9-46170 discloses an arrangement in which two filters are cascaded and housed in one container.
【0004】この特開平9−46170号の図1、図3
には、2個のフィルタを各別の圧電基板に構成し、各圧
電基板は3カ所の角隅を導電性接着剤で固着し、かつ導
通させて縦続接続したものが示されている。そして、図
4、図6、図7には1つの圧電基板に2組の電極群を形
成し、各角隅および長辺の中央の合計6カ所を導電性接
着剤で固着して導通させ縦続接続したものが示されてい
る。FIGS. 1 and 3 of this Japanese Patent Application Laid-Open No. 9-46170.
In FIG. 2, two filters are formed on different piezoelectric substrates, and each of the piezoelectric substrates is fixed at three corners with a conductive adhesive and connected in cascade with conduction. In FIGS. 4, 6, and 7, two sets of electrodes are formed on one piezoelectric substrate, and a total of six corners and the center of the long side are fixed with a conductive adhesive to conduct and cascade. What is connected is shown.
【0005】しかして、圧電基板として水晶を用いた中
心周波数80MHz程度のモノリシック・フィルタで、
形状の小型のものでは、圧電基板の大きさは3mm角程
度の大きさになる。したがって、このように形状が小さ
な2個の水晶片を容器の所定の位置に正確に位置決めし
て固着することは組立が面倒でコストが高価になる問題
がある。A monolithic filter using quartz as a piezoelectric substrate and having a center frequency of about 80 MHz,
In a small-sized shape, the size of the piezoelectric substrate is about 3 mm square. Therefore, it is troublesome to assemble the two pieces of quartz having a small shape in such a manner that they are accurately positioned and fixed at predetermined positions of the container, and the cost is high.
【0006】このため、特開平9−46170号の図
4、図6、図7に示されるように1枚の水晶基板に2個
のフィルタを構成することが考えられる。しかしなが
ら、このような場合、個々のフイルタの減衰特性を調整
するため、及び2個のフィルタの直列接続点に負荷容量
を接続するために、入・出力電極を各別に外部へ導出す
る必要がある。For this reason, as shown in FIGS. 4, 6 and 7 of Japanese Patent Application Laid-Open No. 9-46170, it is conceivable to form two filters on one quartz substrate. However, in such a case, in order to adjust the attenuation characteristics of the individual filters and to connect the load capacitance to the series connection point of the two filters, it is necessary to separately lead the input and output electrodes to the outside. .
【0007】したがって外部に導出する端子数は、少な
くとも入・出力電極に4個、アース電極に1個の合計5
個になる。さらに、個々のフィルタ毎にアース電極を導
出するようにすれば、高周波的な平衡を容易に得ること
ができる。しかしながらこの場合は、合計6個の電極を
外部へ導出しなければならない。Therefore, the number of terminals led out is at least four for the input / output electrodes and one for the ground electrode, for a total of five terminals.
Individual. Furthermore, if a ground electrode is derived for each filter, a high-frequency balance can be easily obtained. However, in this case, a total of six electrodes must be led out.
【0008】一方、水晶基板から電極を導出する場合、
不要な高周波信号の結合を避けるためには、各電極の相
互の距離をできるだけ離すことが望ましい。このように
すれば各電極相互の高周波的な結合を最も少なくでき良
好な減衰特性を得ることができる。したがって、6個の
電極を導出する場合、水晶基板の各角隅及び長辺の中央
の、合計6カ所から電極を導出することが考えられる。On the other hand, when the electrodes are derived from the quartz substrate,
In order to avoid unnecessary coupling of high-frequency signals, it is desirable that the distance between the electrodes is as large as possible. By doing so, high-frequency coupling between the electrodes can be minimized, and good attenuation characteristics can be obtained. Therefore, when six electrodes are derived, it is conceivable that the electrodes are derived from a total of six locations at the corners and the center of the long side of the quartz substrate.
【0009】発明者らは、図3に示す平面図のようなモ
ノリシック・フィルタを実際に製作して特性を測定し
た。このフィルタは、5mmx2.5mmの大きさの水
晶基板14に、中心周波数約80MHzの2個のモノリ
シック・フィルタ15、16を形成し、かつこの2個の
フィルタを縦続に接続した。このフィルタは図3に示す
ように水晶基板の6カ所から電極を導出している。そし
て、各電極をセラミックからなる箱型の容器17の内側
の底面に形成した6カ所の保持電極18に導電性接着剤
19で固着して保持した表面実装型の4ポール・モノリ
シック・フィルタとした。The inventors actually manufactured a monolithic filter as shown in the plan view of FIG. 3 and measured the characteristics. In this filter, two monolithic filters 15 and 16 having a center frequency of about 80 MHz were formed on a quartz substrate 14 having a size of 5 mm × 2.5 mm, and the two filters were connected in cascade. In this filter, as shown in FIG. 3, electrodes are led out of six places on the quartz substrate. Then, a surface-mounted 4-pole monolithic filter in which each electrode is fixed and held with conductive adhesive 19 to six holding electrodes 18 formed on the inner bottom surface of a box-shaped container 17 made of ceramic is provided. .
【0010】このような構造の複数個のフィルタの温度
特性を測定した。この結果、図4に示す温度特性のグラ
フのように、減衰特性の中心周波数の温度に対する変化
は極めて大きい。すなわち、25℃における中心周波数
に対して、−30℃〜80℃の範囲で変化を測定する
と、特に低温の−30℃において35〜80ppm程度
の変動を生じ、平均の変動値は50ppmであった。し
たがって、このようなものでは、たとえば最近の携帯型
の無線機器で要求される温度変化に対する中心周波数の
最大変動量±30ppmの規格を満たすことができな
い。The temperature characteristics of a plurality of filters having such a structure were measured. As a result, as shown in the graph of the temperature characteristic shown in FIG. 4, the change of the center frequency of the attenuation characteristic with respect to temperature is extremely large. That is, when the change was measured in the range of −30 ° C. to 80 ° C. with respect to the center frequency at 25 ° C., a fluctuation of about 35 to 80 ppm was generated particularly at −30 ° C. at a low temperature, and the average fluctuation value was 50 ppm. . Therefore, such a device cannot meet the standard of the maximum fluctuation amount of the center frequency ± 30 ppm with respect to the temperature change required for, for example, recent portable wireless devices.
【0011】発明者らは、フィルタの中心周波数の変動
の原因を探る種々の研究を行った。この結果、セラミッ
クからなる容器と水晶片の熱膨張係数の差異のため、温
度変化により水晶片を固着する導電性接着剤を介して水
晶片に応力が作用し、この影響によって中心周波数の変
動を生じていると推定し得る現象が認められた。The present inventors have conducted various studies to find the cause of the fluctuation of the center frequency of the filter. As a result, due to the difference in the coefficient of thermal expansion between the ceramic container and the quartz piece, stress acts on the quartz piece through a conductive adhesive that fixes the quartz piece due to temperature change, and this effect causes a change in the center frequency. A phenomenon that could be presumed to have occurred was observed.
【0012】[0012]
【発明が解決しようとする課題】本発明は上記の事情に
鑑みてなされたもので、温度変化による減衰特性の中心
周波数の変化を少なくし、安定な特性を得ることのでき
る4ポール・モノリシック・フィルタを提供することを
目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to reduce a change in the center frequency of an attenuation characteristic due to a temperature change and to obtain a four-pole monolithic type capable of obtaining a stable characteristic. It is intended to provide a filter.
【0013】[0013]
【課題を解決するための手段】本発明は、1枚の矩形の
水晶板に2組のモノリシック・フィルタを形成して縦続
接続した表面実装型の4ポール・モノリシック・フィル
タにおいて、水晶板の第1の角隅に形成した第1の接続
電極と、第1の角隅に対向する第2の角隅に形成した第
2の接続電極と、第1、第2の接続電極の間に縦続接続
して設けた2組のモノリシック・フィルタと、水晶板の
一方の長辺の中央部に設けられ2組のモノリシック・フ
ィルタの縦続接続点を導出した第3の接続電極と、水晶
片の他方の長辺の中央部に設けられ各モノリシック・フ
ィルタのアース電極を導出した第4の接続電極とを具備
し、上記第1、第2、第3、第4の各接続電極を表面実
装用の容器に形成した保持電極に導電性接着剤で接着し
て機械的に保持するとともに電気的に導通させたことを
特徴とする4ポール・モノリシック・フィルタを特徴と
するものである。SUMMARY OF THE INVENTION The present invention relates to a surface-mounted 4-pole monolithic filter in which two sets of monolithic filters are formed on a single rectangular crystal plate and cascaded, and A first connection electrode formed at a first corner, a second connection electrode formed at a second corner opposite to the first corner, and a cascade connection between the first and second connection electrodes; Sets of monolithic filters, a third connection electrode provided at the center of one long side of the quartz plate to derive a cascade connection point of the two sets of monolithic filters, and the other of the quartz pieces. A fourth connection electrode provided at the center of the long side and leading out a ground electrode of each monolithic filter, wherein the first, second, third, and fourth connection electrodes are mounted on a surface mounting container. Adhesion to the holding electrode formed in the above with a conductive adhesive and mechanically holding And it is characterized in 4-pole monolithic filter is characterized in that is electrically connected with.
【0014】[0014]
【実施例】以下、本発明の実施の形態を、図1に示す平
面図を参照して詳細に説明する。なおこのモノリシック
・フィルタは従来のものとの特性の比較を容易に行える
ように図3に示す従来のモノリシックフイルタと同じ水
晶片、同じ周波数とした。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the plan view shown in FIG. The monolithic filter has the same crystal blank and the same frequency as the conventional monolithic filter shown in FIG. 3 so that the characteristics of the monolithic filter can be easily compared with those of the conventional monolithic filter.
【0015】図中1は、たとえばセラミックからなる矩
形の表面実装用の容器である。この容器は底面に少なく
とも4個の実装端子を形成し、上面に収納部2を設け、
ここに保持電極を形成している。そして、収納部2に水
晶片3を収納している。この水晶片3は、人工水晶の結
晶を、結晶軸に対して所定の角度で切断して、短冊板状
に成形している。そして、水晶片3に、2組のモノリシ
ック・フィルタ4、5を形成して縦続に接続している。In FIG. 1, reference numeral 1 denotes a rectangular surface mounting container made of, for example, ceramic. This container forms at least four mounting terminals on the bottom surface, and has a storage part 2 on the upper surface,
Here, a holding electrode is formed. The crystal blank 3 is housed in the housing 2. The crystal blank 3 is formed by cutting a crystal of artificial quartz at a predetermined angle with respect to a crystal axis to form a strip. Then, two sets of monolithic filters 4 and 5 are formed on the crystal blank 3 and connected in cascade.
【0016】水晶片3の、第1の角隅に第1の接続電極
6、この第1の角隅に対向する第2の角隅に第2の接続
電極7を形成している。そして、第1、第2の接続電極
6、7の間に2組のモノリシック・フィルタ4、5を縦
続接続にして介挿している。さらに水晶片3の一方の長
辺の中央部に第3の接続電極8を形成し、この第3の接
続電極に2組のモノリシック・フィルタ4、5の縦続接
続点を導出している。A first connection electrode 6 is formed at a first corner of the crystal blank 3, and a second connection electrode 7 is formed at a second corner opposite to the first corner. Then, two sets of monolithic filters 4 and 5 are interposed between the first and second connection electrodes 6 and 7 in cascade connection. Further, a third connection electrode 8 is formed at the center of one long side of the crystal blank 3, and cascade connection points of two sets of monolithic filters 4, 5 are led out to the third connection electrode.
【0017】そして、水晶片3の他方の長辺の中央部に
第4の接続電極9を形成し、この第4の接続電極9に、
各モノリシック・フィルタ4、5のアース電極を導出し
ている。一方、容器1の収納部に、上記第1、第2、第
3、第4の各接続電極6、7、8、9に対応して、それ
ぞれ保持電極10、10B、10C、10Dを形成して
いる。そして、第1、第2、第3、第4の各接続電極
6、7、8、9を、それぞれ対応する保持電極に導電性
接着剤で固着し、電気的な導通を図るようにしている。
なお所定の特性を得るように調整後、容器1の上面開口
には金属薄板の蓋を被せてシーム溶接等によって気密に
封止する。A fourth connection electrode 9 is formed at the center of the other long side of the crystal blank 3, and the fourth connection electrode 9 is
The ground electrodes of the monolithic filters 4 and 5 are led out. On the other hand, holding electrodes 10, 10B, 10C, and 10D are formed in the storage portion of the container 1 corresponding to the first, second, third, and fourth connection electrodes 6, 7, 8, and 9, respectively. ing. Then, the first, second, third, and fourth connection electrodes 6, 7, 8, and 9 are fixed to the corresponding holding electrodes with a conductive adhesive to achieve electrical conduction. .
After adjustment so as to obtain predetermined characteristics, the top opening of the container 1 is covered with a thin metal plate lid and hermetically sealed by seam welding or the like.
【0018】このような構成であれば、水晶片を4点で
固着するようにしている。したがって、従来の6点で水
晶片3を固着して、保持するものに比して、構造的な自
由度が大きく、それによって温度変化によって水晶片に
作用する応力を小さくすることができる。With such a configuration, the crystal blank is fixed at four points. Therefore, the crystal blank 3 has a greater degree of structural freedom than the conventional one in which the crystal blank 3 is fixed and held at six points, whereby the stress acting on the crystal blank due to a temperature change can be reduced.
【0019】しかして、この様な保持構造によるモノリ
シック・フィルタの温度特性は、図5に示すように良好
であった。すなわち、−30℃〜80℃の範囲で変化を
測定すると、低温の−30℃においても15〜32pp
mの変動であり、平均の変動値は22ppmであり、た
とえば最近の携帯型の無線機器で要求される温度変化に
対する中心周波数の最大変動量±30ppmの規格を満
たすことができた。Thus, the temperature characteristics of the monolithic filter having such a holding structure were good as shown in FIG. That is, when the change is measured in the range of −30 ° C. to 80 ° C., it is 15 to 32 pp
m, and the average fluctuation value is 22 ppm. For example, the standard of the maximum fluctuation amount of the center frequency ± 30 ppm with respect to the temperature change required in recent portable wireless devices could be satisfied.
【0020】[0020]
【発明の効果】以上詳述したように、本発明によれば、
温度変化による減衰特性の中心周波数の変化を少なくで
き、安定な特性を得ることのできる4ポール・モノリシ
ック・フィルタを提供することができる。As described in detail above, according to the present invention,
It is possible to provide a four-pole monolithic filter capable of reducing a change in the center frequency of the attenuation characteristic due to a temperature change and obtaining a stable characteristic.
【図1】本発明の一実施例の4ポール・モノリシック・
フィルタの平面図である。FIG. 1 illustrates a four-pole monolithic embodiment of the present invention.
It is a top view of a filter.
【図2】4ポール・モノリシック・フィルタの回路図で
ある。FIG. 2 is a circuit diagram of a four-pole monolithic filter.
【図3】従来の4ポール・モノリシック・フィルタの平
面図である。FIG. 3 is a plan view of a conventional four-pole monolithic filter.
【図4】従来の4ポール・モノリシック・フィルタの温
度特性の一例を示すグラフである。FIG. 4 is a graph showing an example of a temperature characteristic of a conventional four-pole monolithic filter.
【図5】本発明の4ポール・モノリシック・フィルタの
温度特性の一例を示すグラフである。FIG. 5 is a graph showing an example of the temperature characteristics of the four-pole monolithic filter of the present invention.
3 ・・ 水晶片 6、7、8、9 ・・ 接続電極 10A〜10D ・・ 保持電極 3 ··· Crystal blank 6, 7, 8, 9 ··· Connection electrode 10A to 10D ··· Holding electrode
Claims (1)
・フィルタを形成して縦続接続した表面実装型の4ポー
ル・モノリシック・フィルタにおいて、 水晶板の第1の角隅に形成した第1の接続電極と、第1
の角隅に対向する第2の角隅に形成した第2の接続電極
と、第1、第2の接続電極の間に縦続接続して設けた2
組のモノリシック・フィルタと、水晶板の一方の長辺の
中央部に設けられ2組のモノリシック・フィルタの縦続
接続点を導出した第3の接続電極と、水晶片の他方の長
辺の中央部に設けられ各モノリシック・フィルタのアー
ス電極を導出した第4の接続電極とを具備し、上記第
1、第2、第3、第4の各接続電極を表面実装用の容器
に形成した保持電極に導電性接着剤で接着して機械的に
保持するとともに電気的に導通させたことを特徴とする
4ポール・モノリシック・フィルタ。1. A surface mount type four-pole monolithic filter in which two sets of monolithic filters are formed and connected in cascade on a single rectangular quartz plate, wherein a plurality of monolithic filters are formed at a first corner of the quartz plate. 1 connection electrode and 1st connection electrode
A second connection electrode formed at a second corner opposite to the corner of the second connection electrode, and a second connection electrode provided in cascade between the first and second connection electrodes.
A set of monolithic filters, a third connection electrode provided at the center of one long side of the quartz plate to derive a cascade connection point of the two sets of monolithic filters, and a center of the other long side of the quartz piece And a fourth connection electrode extending from the ground electrode of each monolithic filter, and the first, second, third, and fourth connection electrodes are formed in a surface mounting container. A four-pole monolithic filter, wherein the filter is mechanically held and electrically connected to the filter by means of a conductive adhesive.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000384792A JP3682224B2 (en) | 2000-12-19 | 2000-12-19 | 4-pole monolithic filter |
US10/017,448 US6583689B2 (en) | 2000-12-19 | 2001-12-18 | Four-pole monolithic filter held in a container by conductive adhesives at four connecting electrode locations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000384792A JP3682224B2 (en) | 2000-12-19 | 2000-12-19 | 4-pole monolithic filter |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2002185287A true JP2002185287A (en) | 2002-06-28 |
JP3682224B2 JP3682224B2 (en) | 2005-08-10 |
Family
ID=18852175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000384792A Expired - Fee Related JP3682224B2 (en) | 2000-12-19 | 2000-12-19 | 4-pole monolithic filter |
Country Status (2)
Country | Link |
---|---|
US (1) | US6583689B2 (en) |
JP (1) | JP3682224B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014086983A (en) * | 2012-10-26 | 2014-05-12 | Daishinku Corp | Piezoelectric filter |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070211062A1 (en) * | 2006-03-13 | 2007-09-13 | International Business Machines Corporation | Methods and systems for rendering complex text using glyph identifiers in a presentation data stream |
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2001
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JP2014086983A (en) * | 2012-10-26 | 2014-05-12 | Daishinku Corp | Piezoelectric filter |
Also Published As
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US20020075100A1 (en) | 2002-06-20 |
JP3682224B2 (en) | 2005-08-10 |
US6583689B2 (en) | 2003-06-24 |
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